The Shimano Tiagra BR-R451 Dual-Pivot Brake Calliper offers reliable stopping power with a 57 mm drop, designed specifically for rear wheel use. Its dual-pivot mechanism ensures balanced braking force and improved modulation, enhancing control and safety during rides. Engineered for durability and consistent performance, this calliper is ideal for riders seeking precise braking response on road bikes equipped with 57 mm drop brakes.